Merge pull request #304 from jolt-lang/tail-frame-history
Recover TCO-elided frames in uncaught-error stack traces
This commit is contained in:
Dmitri Sotnikov
GitHub
commit
bff1c288b0
12 changed files with 616 additions and 172 deletions
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@ -182,6 +182,30 @@ a root, transitively.
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- Source only; compiled `.class` files in a git dep are ignored.
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- git `:git/sha` must be a full SHA (`git fetch` can't resolve a short one).
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## Stack traces
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An uncaught error prints the message, the top-level source location, and — when
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frames are available — a `trace:` backtrace. In an AOT `jolt build --direct-link`
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binary the frames map to `ns/name (file:line)`; on the runtime eval path they are
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the surviving fn names. Tail-call optimization erases tail-called frames, so the
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default trace shows only the non-tail spine.
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A fuller **tail-frame history** recovers the frames TCO erases: each compiled fn
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records itself on entry into a bounded ring-of-rings buffer, so the trace shows
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TCO-elided frames (including the immediate error site) while a tight tail loop
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stays bounded and its non-tail caller context is preserved.
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It is **on by default in REPL-driven development** — a `repl` or nREPL session
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turns it on, so an error in code you evaluate or reload shows a tail-frame trace
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with no setup. Because the recording is baked in at compile time, only code
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compiled while a session is live is traced; reload a namespace to trace code that
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was already loaded (e.g. an app's initial `-M:run` load before its nREPL started).
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Elsewhere it is off (a small per-call cost, and never emitted into a `jolt build`
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binary). Override with the environment: `JOLT_TRACE=1` forces it on for a whole
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run — including a plain `-M:run`, so the app's own load is traced — and
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`JOLT_TRACE=0` forces it off, even in a REPL/nREPL session.
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## Conformance
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The known-working libraries (see [libraries.md](libraries.md)) and the
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@ -94,6 +94,28 @@ for frame in 'app.util/deep-boom' 'app.util/mid-boom' 'app.core/-main'; do
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exit 1
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fi
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done
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# A built binary runs -main with *ns* = user, like clojure.main — so a runtime
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# resolve of an aliased symbol is nil (the alias lives in the entry ns, not user),
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# matching the JVM and interpreted joltc rather than the entry ns's alias table. A
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# separate app: `resolve` defeats tree-shaking, so keep it out of the shake test's
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# app above.
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nsp="$(dirname "$out")/nsparity"
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mkdir -p "$nsp/src/nsp"
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printf '{:paths ["src"]}\n' > "$nsp/deps.edn"
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printf '(ns nsp.lib)\n(defn thing [] 1)\n' > "$nsp/src/nsp/lib.clj"
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printf '(ns nsp.main (:require [nsp.lib :as l]))\n(defn -main [& _]\n (println "ns:" (str *ns*))\n (println "resolve:" (pr-str (resolve (quote l/thing))))\n (println "ns-resolve:" (pr-str (ns-resolve (quote nsp.lib) (quote thing)))))\n' > "$nsp/src/nsp/main.clj"
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nspout="$(dirname "$out")/nsparity-bin"
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if ! JOLT_PWD="$nsp" bin/joltc build -m nsp.main -o "$nspout" >/dev/null 2>&1; then
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echo " FAIL: jolt build of the ns-parity app exited non-zero"; exit 1
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fi
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nsp_out="$(cd / && "$nspout" 2>&1)"
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if ! printf '%s' "$nsp_out" | grep -q 'ns: user' \
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|| ! printf '%s' "$nsp_out" | grep -q '^resolve: nil' \
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|| ! printf '%s' "$nsp_out" | grep -q "ns-resolve: #'nsp.lib/thing"; then
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echo " FAIL: built binary -main ns parity — want 'ns: user', 'resolve: nil', ns-resolve found"
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echo "--- got ----"; echo "$nsp_out"
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exit 1
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fi
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# Tree-shaking (opt-in): same result, and an unreachable def (the `twice` macro,
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# expanded at AOT and never called at runtime) is dropped.
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if ! JOLT_PWD="$app" bin/joltc build -m app.core -o "$out" --tree-shake >/dev/null 2>&1; then
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@ -580,6 +580,12 @@
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;; render an uncaught throw (+ Clojure backtrace) instead
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;; of Chez's opaque dump, then exit non-zero.
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" (guard (v (#t (jolt-report-throwable v (current-error-port)) (exit 1)))\n"
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;; Loading the app left the current ns at the entry ns; reset
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;; it to `user` before -main, matching clojure.main (*ns* is
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;; `user` when a `-m` -main runs, so a runtime resolve of an
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;; aliased symbol behaves the same as on the JVM / interpreted
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;; joltc, not off the entry ns's alias table).
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" (set-chez-ns! \"user\")\n"
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" (when (and maincell (var-cell-defined? maincell))\n"
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" (apply jolt-invoke (var-cell-root maincell) args))))\n"
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" (exit 0)))\n"))
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@ -110,6 +110,33 @@
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;; older seed during the first re-mint pass.
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(let ((scv (var-deref "jolt.backend-scheme" "set-var-cache!")))
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(when (procedure? scv) (scv #t)))
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;; JOLT_TRACE is a falsey value (case-insensitive) — the single predicate both the
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;; dev-mode enable and the whole-run enable consult, so "off" never accidentally
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;; means "on". An empty / unset value is NOT falsey here — it carries no signal, so
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;; dev mode still traces and a whole run still doesn't.
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(define (jolt-trace-env-off? e)
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(and (string? e)
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(let ((s (string-downcase e)))
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(or (string=? s "0") (string=? s "false") (string=? s "no")
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(string=? s "off") (string=? s "n")))))
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;; Tail-frame history. Turning it on makes the emitter add a per-fn history push to
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;; every fn compiled AFTERWARD, and allocates this thread's ring. Suppressed when
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;; JOLT_TRACE is a falsey value, so JOLT_TRACE=0 / off / no disables it in dev mode.
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(define (jolt-enable-trace!)
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(unless (jolt-trace-env-off? (getenv "JOLT_TRACE"))
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(let ((stf (var-deref "jolt.backend-scheme" "set-trace-frames!")))
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(when (procedure? stf) (stf #t)))
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(jolt-trace-enable!)))
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;; Exposed so the REPL / nREPL entrypoints (jolt.main, jolt.nrepl) can turn tracing
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;; on for REPL-driven development without the user setting JOLT_TRACE. Because the
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;; push is baked in at compile time, only code compiled after this call is traced —
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;; which is exactly the code you eval / reload in a live session.
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(def-var! "jolt.host" "enable-trace!" jolt-enable-trace!)
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;; Explicit opt-in for a whole run (JOLT_TRACE=1): enable at load, BEFORE any app
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;; namespace is compiled, so a plain `-M:run` traces the app's own code too. Only an
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;; affirmative value (set, non-empty, not falsey) forces it on here.
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(let ((e (getenv "JOLT_TRACE")))
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(when (and e (fx>? (string-length e) 0) (not (jolt-trace-env-off? e))) (jolt-enable-trace!)))
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;; (with-meta sym m) -> sym, else x — an (ns ^:no-doc name …) yields the name with
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;; reader metadata as a with-meta form; strip it to read the bare ns symbol.
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@ -235,6 +262,9 @@
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;; record this form's source location first, so a compile- or run-time error
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;; in it reports the right place.
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(jolt-enter-form! form)
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;; drop tail-frame history from earlier top-level forms, so an error's trace
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;; shows only this form's own call history (a no-op unless JOLT_TRACE is on).
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(jolt-trace-reset!)
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(eval (read (open-input-string (jolt-analyze-emit-form form ns)))
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(interaction-environment)))))
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@ -46,6 +46,10 @@
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;; after it). Guarded for the first re-mint pass off an older seed.
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(let ((scv (var-deref "jolt.backend-scheme" "set-var-cache!")))
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(when (procedure? scv) (scv #f)))
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;; Tail-frame tracing off for the mint + `jolt build`: the seed must stay a
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;; byte-fixpoint, and a built app should carry no per-call trace overhead.
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(let ((stf (var-deref "jolt.backend-scheme" "set-trace-frames!")))
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(when (procedure? stf) (stf #f)))
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(define (ei-compile-form ctx f optimize?)
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(let ((ir (jolt-ce-analyze ctx f)))
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(jolt-ce-emit-top (if optimize? (jolt-ce-run-passes ir ctx) ir))))
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106
host/chez/rt.ss
106
host/chez/rt.ss
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@ -60,6 +60,112 @@
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;; stack trace (source-registry.ss). call/cc is paid only on a throw, never per
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;; call; the captured k is walked, never invoked.
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(define jolt-throw-cont (make-thread-parameter #f))
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;; --- tail-frame history: a ring of rings (opt-in) ----------------------------
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;; TCO erases tail-called frames from the native continuation, so an uncaught
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;; error's backtrace shows only the surviving non-tail spine — the immediate error
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;; site is often a tail call and is missing. When tracing is enabled (JOLT_TRACE,
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;; wired in compile-eval.ss), each compiled fn records its frame-name on entry, and
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;; the reporter reads this history to recover TCO-elided frames.
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;;
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;; The store is MIT-Scheme's "history" shape — a ring of rings. The OUTER ring
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;; holds one RIB per non-tail subproblem (the real call spine); each rib's INNER
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;; ring holds the recent tail-calls made AT that subproblem. A non-tail entry
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;; advances the outer ring (a fresh rib); a tail entry rotates the current rib's
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;; inner ring. So a tight tail loop (mutual recursion, a non-recur self-tail-call)
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;; churns ONE rib's small inner ring instead of flushing the outer spine — the
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;; caller context that led into the loop survives. Both rings are fixed-size, so
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;; the whole history is bounded: a constant space factor, NOT a change to the
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;; asymptotic space TCO guarantees.
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;;
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;; Whether an entry is tail or non-tail is set by the CALLER: the emitter marks a
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;; tail call with (jolt-trace-mark! #t) right before it; a non-tail entry is the
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;; default. NOTE this is best-effort: a tail call routed through jolt-invoke to a
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;; target that has no entry prologue (a core/native fn, an anonymous fn held in a
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;; var) does not consume the mark, so a following non-tail frame can be mislabeled
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;; as a tail rotation — a cosmetic mis-grouping in the trace, never a wrong result.
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(define jolt-trace-outer-size 48) ; ribs (non-tail spine depth kept)
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(define jolt-trace-inner-size 6) ; tail-calls kept per subproblem
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;; A history: #(ribs-vector outer-head outer-count). A rib: #(name-vector head count).
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(define (jolt-make-rib) (vector (make-vector jolt-trace-inner-size #f) 0 0))
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(define (jolt-make-history)
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(let ((ribs (make-vector jolt-trace-outer-size #f)))
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(let loop ((i 0))
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(when (fx<? i jolt-trace-outer-size)
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(vector-set! ribs i (jolt-make-rib)) (loop (fx+ i 1))))
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(vector ribs 0 0)))
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;; A global switch (all threads) plus a per-thread ring, lazily created on first
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;; use — so code run on a spawned thread (a future/agent) records into ITS OWN
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;; history, not the enabling thread's (make-thread-parameter hands a new thread the
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;; initial #f, so we can't rely on inheritance).
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(define jolt-trace-on? #f)
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(define jolt-trace-ring (make-thread-parameter #f))
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(define jolt-trace-tail? (make-thread-parameter #f)) ; caller-set, consumed per entry
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(define (jolt-trace-enable!) (set! jolt-trace-on? #t) (jolt-trace-ring (jolt-make-history)))
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;; this thread's ring, created on demand while tracing is on
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(define (jolt-trace-cur-ring)
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(or (jolt-trace-ring)
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(and jolt-trace-on? (let ((h (jolt-make-history))) (jolt-trace-ring h) h))))
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;; Drop accumulated history at a top-level boundary (compile-eval.ss calls this per
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;; top-level form) so an error's trace shows only the forms that led to it, not the
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;; frames of earlier, already-returned REPL/eval forms.
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(define (jolt-trace-reset!)
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(when (jolt-trace-ring) (jolt-trace-ring (jolt-make-history)) (jolt-trace-tail? #f)))
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(define (jolt-trace-mark! t) (jolt-trace-tail? t))
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;; push name into a rib's inner ring
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(define (jolt-rib-push! rib name)
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(let ((buf (vector-ref rib 0)) (i (vector-ref rib 1)) (cnt (vector-ref rib 2)))
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(vector-set! buf i name)
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(vector-set! rib 1 (fxmod (fx+ i 1) jolt-trace-inner-size))
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(when (fx<? cnt jolt-trace-inner-size) (vector-set! rib 2 (fx+ cnt 1)))))
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;; a non-tail entry: advance the outer ring, reset the new rib, seed it with name
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(define (jolt-history-nontail! h name)
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(let* ((ribs (vector-ref h 0)) (oh (vector-ref h 1)) (oc (vector-ref h 2))
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(rib (vector-ref ribs oh)))
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(vector-set! rib 1 0) (vector-set! rib 2 0)
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(jolt-rib-push! rib name)
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(vector-set! h 1 (fxmod (fx+ oh 1) jolt-trace-outer-size))
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(when (fx<? oc jolt-trace-outer-size) (vector-set! h 2 (fx+ oc 1)))))
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;; a tail entry: rotate the CURRENT rib's inner ring (bootstrap a rib if none yet)
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(define (jolt-history-tail! h name)
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(if (fx=? (vector-ref h 2) 0)
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(jolt-history-nontail! h name)
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(let* ((ribs (vector-ref h 0))
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(cur (fxmod (fx+ (fx- (vector-ref h 1) 1) jolt-trace-outer-size)
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jolt-trace-outer-size)))
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(jolt-rib-push! (vector-ref ribs cur) name))))
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;; Record a frame entry, routed by the caller's tail mark; then reset the mark so a
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;; subsequent entry reached WITHOUT a mark (e.g. via apply) defaults to non-tail.
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(define (jolt-trace-push! name)
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(let ((h (jolt-trace-cur-ring)))
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(when h
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(if (jolt-trace-tail?) (jolt-history-tail! h name) (jolt-history-nontail! h name))
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(jolt-trace-tail? #f)))
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jolt-nil)
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;; a rib's inner names, most-recent (deepest) tail first
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(define (jolt-rib-names rib)
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(let ((buf (vector-ref rib 0)) (head (vector-ref rib 1)) (cnt (vector-ref rib 2)))
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(let loop ((k 1) (acc '()))
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(if (fx>? k cnt)
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(reverse acc)
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(loop (fx+ k 1)
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(cons (vector-ref buf (fxmod (fx+ (fx- head k) jolt-trace-inner-size)
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jolt-trace-inner-size))
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acc))))))
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;; The whole history flattened to frame-names, most-recent (deepest) first:
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;; current rib's tail-history, then its non-tail caller's, and so on outward.
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(define (jolt-trace-snapshot)
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(let ((h (jolt-trace-ring)))
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(if (not h) '()
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(let* ((ribs (vector-ref h 0)) (oh (vector-ref h 1)) (oc (vector-ref h 2)))
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(let loop ((k 1) (acc '()))
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(if (fx>? k oc)
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(apply append (reverse acc))
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(let ((idx (fxmod (fx+ (fx- oh k) jolt-trace-outer-size) jolt-trace-outer-size)))
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(loop (fx+ k 1) (cons (jolt-rib-names (vector-ref ribs idx)) acc)))))))))
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(define-condition-type &jolt-throw &condition
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make-jolt-throw-condition jolt-throw-condition?
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(value jolt-throw-condition-value))
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File diff suppressed because one or more lines are too long
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@ -30,6 +30,39 @@ check_loc() {
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fi
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}
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# An uncaught error's stack trace must name the runtime-eval'd fn frames that
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# survive TCO (the non-tail spine), even though the eval path registers no source
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# map — "print what is available". Asserts a substring appears under " trace:".
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check_trace() {
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err="$(bin/joltc -e "$1" 2>&1 >/dev/null)"
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if printf '%s' "$err" | grep -q ' trace:' && printf '%s' "$err" | grep -q "$2"; then
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pass=$((pass + 1))
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else
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echo " FAIL (trace): $1"
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echo " want stderr trace to contain \`$2\`, got \`$err\`"
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fails=$((fails + 1))
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fi
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}
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# JOLT_TRACE opts into the tail-frame history (the ring of rings): every $2 (an
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# ERE) must match the " trace:" block. Used to assert TCO-elided frames are
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# recovered and non-tail caller context survives a tail loop.
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check_trace_on() {
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err="$(JOLT_TRACE=1 bin/joltc -e "$1" 2>&1 >/dev/null)"
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ok=1
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printf '%s' "$err" | grep -q ' trace:' || ok=0
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shift
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for want in "$@"; do
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printf '%s' "$err" | grep -Eq "$want" || ok=0
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done
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if [ "$ok" = 1 ]; then
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pass=$((pass + 1))
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else
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echo " FAIL (trace-on): want [$*] in trace, got \`$err\`"
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fails=$((fails + 1))
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fi
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}
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check '(+ 1 2)' '3'
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check '(defn fib [n] (if (< n 2) n (+ (fib (- n 1)) (fib (- n 2))))) (fib 15)' '610'
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check '(->> (range 10) (filter even?) (map (fn [x] (* x x))) (reduce +))' '120'
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@ -60,6 +93,38 @@ check '(try (load-string "(+") (catch :default e (ex-message e)))' 'EOF while re
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check_loc '(throw (ex-info "boom" {}))' 'boom'
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check_loc '(do (+ 1 1) (/ 1 0))' ' at 1:'
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# Runtime-eval'd fns aren't source-mapped, but their native frame names survive on
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# the non-tail spine; the trace must show them. deepest/+ are tail calls (erased);
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# middle and outer wait on a non-tail (inc …) so their frames are live at the throw.
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trace_prog='(defn deepest [x] (+ x 1)) (defn middle [x] (inc (deepest x))) (defn outer [x] (inc (middle x))) (outer :nan)'
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check_trace "$trace_prog" 'middle'
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check_trace "$trace_prog" 'outer'
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# JOLT_TRACE (tail-frame history / ring of rings). An all-tail chain is entirely
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# TCO-erased from the continuation, but the history recovers every frame — incl.
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# `deepest`, the actual error site.
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check_trace_on '(defn deepest [x] (+ x 1)) (defn middle [x] (deepest x)) (defn outer [x] (middle x)) (outer :nan)' \
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'deepest' 'middle' 'outer'
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# A tail loop (a<->b) under a NON-tail caller: the loop is confined to one rib's
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# bounded inner ring, so the caller context (`driver`, `top`) is NOT flushed out —
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# the point of the ring of rings.
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check_trace_on '(declare b) (defn a [n] (if (zero? n) (+ :x 1) (b (dec n)))) (defn b [n] (a n)) (defn driver [] (inc (a 6))) (defn top [] (inc (driver))) (top)' \
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'driver' 'top'
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# A ^long/^double return hint wraps the body in a coercion, so the hinted fn's call
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# is NOT a tail call — its own frame is still live and must appear (not be elided).
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check_trace_on '(defn g [n] (+ :x n)) (defn ^long f [n] (g n)) (f 3)' 'f' 'g'
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# History is per top-level form: a later form's error trace shows its own frames
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# (h2/u2), not frames from an earlier, already-returned form (h1/u1).
|
||||
check_trace_on '(defn h1 [x] (inc x)) (defn u1 [] (inc (h1 5))) (u1) (defn h2 [x] (+ :x x)) (defn u2 [] (inc (h2 5))) (u2)' \
|
||||
'h2' 'u2'
|
||||
err_stale="$(JOLT_TRACE=1 bin/joltc -e '(defn h1 [x] (inc x)) (defn u1 [] (inc (h1 5))) (u1) (defn h2 [x] (+ :x x)) (defn u2 [] (inc (h2 5))) (u2)' 2>&1 >/dev/null)"
|
||||
if printf '%s' "$err_stale" | grep -q 'h1'; then
|
||||
echo " FAIL (trace-on): stale frame h1 from an earlier form leaked into the trace"
|
||||
fails=$((fails + 1))
|
||||
else
|
||||
pass=$((pass + 1))
|
||||
fi
|
||||
|
||||
# --help prints usage, and lists the nREPL server under its real flag name.
|
||||
help_out="$(bin/joltc --help 2>/dev/null)"
|
||||
if printf '%s' "$help_out" | grep -q -- '--nrepl-server'; then
|
||||
|
|
@ -159,5 +224,25 @@ else
|
|||
fails=$((fails + 1))
|
||||
fi
|
||||
|
||||
# REPL-driven development traces by default: an error in an evaluated form shows a
|
||||
# tail-frame backtrace with no JOLT_TRACE set. rb tail-calls ra tail-calls +, all
|
||||
# TCO-elided from the continuation — only the history recovers them.
|
||||
repl_err="$(printf '(defn ra [x] (+ x 1))\n(defn rb [x] (ra x))\n(rb :nan)\n:exit\n' | bin/joltc repl 2>&1)"
|
||||
if printf '%s' "$repl_err" | grep -q ' trace:' && printf '%s' "$repl_err" | grep -q 'rb'; then
|
||||
pass=$((pass + 1))
|
||||
else
|
||||
echo " FAIL: a REPL error should show a tail-frame trace by default"
|
||||
printf '%s\n' "$repl_err" | sed 's/^/ | /'
|
||||
fails=$((fails + 1))
|
||||
fi
|
||||
# JOLT_TRACE=0 opts out — no trace in the REPL.
|
||||
repl_off="$(printf '(defn ra [x] (+ x 1))\n(defn rb [x] (ra x))\n(rb :nan)\n:exit\n' | JOLT_TRACE=0 bin/joltc repl 2>&1)"
|
||||
if printf '%s' "$repl_off" | grep -q ' trace:'; then
|
||||
echo " FAIL: JOLT_TRACE=0 should suppress the REPL trace"
|
||||
fails=$((fails + 1))
|
||||
else
|
||||
pass=$((pass + 1))
|
||||
fi
|
||||
|
||||
echo "cli smoke: $pass passed, $fails failed"
|
||||
[ "$fails" -eq 0 ]
|
||||
|
|
|
|||
|
|
@ -57,10 +57,36 @@
|
|||
((symbol? nm) (symbol->string nm))
|
||||
(else #f)))))))
|
||||
|
||||
;; Walk a continuation, returning the registered jolt frames (innermost first) as
|
||||
;; (frame-name . record) pairs, where record is #(ns name file line) or the symbol
|
||||
;; 'ambiguous. Unmapped frames (host spine, anonymous lambdas) are skipped; raw
|
||||
;; depth is capped.
|
||||
;; Frame names that are pure Chez / jolt-runtime plumbing — the eval boundary,
|
||||
;; the var-cell trampoline, continuation/winder internals. They carry no Clojure
|
||||
;; meaning, so an unmapped frame with one of these names is dropped from the trace
|
||||
;; (a MAPPED frame is always kept — a jolt fn that happens to share the name still
|
||||
;; resolves to its source). Any name Chez prefixes with `$` (system) or that jolt
|
||||
;; prefixes with `jolt-` (host runtime) is plumbing too.
|
||||
(define srcreg-plumbing-names
|
||||
(let ((h (make-hashtable string-hash string=?)))
|
||||
(for-each (lambda (s) (hashtable-set! h s #t))
|
||||
'("dynamic-wind" "winder-dummy" "ksrc" "invoke" "apply"
|
||||
"call-with-values" "call/cc" "call-with-current-continuation"
|
||||
"raise" "raise-continuable" "with-exception-handler" "guard"
|
||||
"eval" "compile" "interpret" "expand" "read" "load"
|
||||
;; host dispatch/coercion helpers (not `jolt-` prefixed) that carry
|
||||
;; no Clojure meaning in a trace
|
||||
"record-method-dispatch" "protocol-resolve" "devirt-resolve"
|
||||
"list->cseq" "host-static-call" "host-call"))
|
||||
h))
|
||||
(define (srcreg-plumbing-name? nm)
|
||||
(or (hashtable-ref srcreg-plumbing-names nm #f)
|
||||
(and (fx>? (string-length nm) 0) (char=? (string-ref nm 0) #\$))
|
||||
(and (fx>=? (string-length nm) 5) (string=? (substring nm 0 5) "jolt-"))))
|
||||
|
||||
;; Walk a continuation, returning its frames (innermost first) as (frame-name .
|
||||
;; record) pairs. record is a source vector #(ns name file line) for a frame that
|
||||
;; maps to registered Clojure source, the symbol 'ambiguous for a short name shared
|
||||
;; across namespaces, or #f for an unmapped-but-named frame (the common case on the
|
||||
;; open-world eval path, where nothing is registered — the bare frame name is still
|
||||
;; a useful trace line). Plumbing frames (host spine, eval boundary) and unnamed
|
||||
;; frames are skipped; raw depth is capped.
|
||||
(define (jolt-frame-records k)
|
||||
;; read the env at call time, not load time: a built binary runs top-level forms
|
||||
;; at heap-build time, where this would always be unset.
|
||||
|
|
@ -70,26 +96,32 @@
|
|||
(if (or (not io) (fx>=? n 400))
|
||||
(reverse acc)
|
||||
(let* ((nm (srcreg-frame-name io))
|
||||
(src (and nm (hashtable-ref source-registry nm #f))))
|
||||
(src (and nm (hashtable-ref source-registry nm #f)))
|
||||
;; keep a frame that maps, or any named frame that isn't plumbing
|
||||
(keep? (and nm (or src (not (srcreg-plumbing-name? nm))))))
|
||||
(when (and debug? nm)
|
||||
(display (string-append " [frame] " nm (if src " *MAPPED*" "") "\n")
|
||||
(display (string-append " [frame] " nm (if src " *MAPPED*"
|
||||
(if keep? "" " (skipped)")) "\n")
|
||||
(current-error-port)))
|
||||
(loop (guard (e (#t #f)) (io 'link)) (fx+ n 1)
|
||||
(if src (cons (cons nm src) acc) acc))))))))
|
||||
(if keep? (cons (cons nm src) acc) acc))))))))
|
||||
|
||||
;; Multi-line backtrace for an uncaught value — " ns/name (file:line)" for a
|
||||
;; mapped frame, the bare frame name for an ambiguous one — or #f when no jolt
|
||||
;; frame maps (the caller then prints just the top-level location). Capped to the
|
||||
;; innermost frames.
|
||||
(define (jolt-backtrace-string v)
|
||||
(let ((k (jolt-error-continuation v)))
|
||||
(and k
|
||||
(let ((recs (jolt-frame-records k)))
|
||||
(and (pair? recs)
|
||||
;; Render a list of (frame-name . record) pairs (innermost/deepest first) to a
|
||||
;; backtrace string. record is a source vector #(ns name file line) -> "ns/name
|
||||
;; (file:line)", or 'ambiguous / #f -> the bare frame name. A run of the same
|
||||
;; frame-name collapses to one "name (xN)" line (deep recursion, or a hot fn a
|
||||
;; loop re-enters), and the number of distinct lines is capped.
|
||||
(define (jolt-render-recs recs)
|
||||
(let ((port (open-output-string)))
|
||||
(let loop ((rs recs) (shown 0))
|
||||
(when (and (pair? rs) (fx<? shown 30))
|
||||
(if (or (null? rs) (fx>=? shown 30))
|
||||
(get-output-string port)
|
||||
(let* ((p (car rs)) (frame-name (car p)) (r (cdr p)))
|
||||
;; count a maximal run of the same frame-name
|
||||
(let run ((tail (cdr rs)) (cnt 1))
|
||||
(if (and (pair? tail) (string=? (car (car tail)) frame-name))
|
||||
(run (cdr tail) (fx+ cnt 1))
|
||||
(begin
|
||||
(put-string port " ")
|
||||
(if (vector? r)
|
||||
(let ((ns (vector-ref r 0)) (nm (vector-ref r 1))
|
||||
|
|
@ -99,10 +131,49 @@
|
|||
(put-string port " (") (put-string port file)
|
||||
(put-string port ":") (put-string port (number->string line))
|
||||
(put-string port ")")))
|
||||
(put-string port frame-name)) ; 'ambiguous: bare name
|
||||
(put-char port #\newline))
|
||||
(loop (cdr rs) (fx+ shown 1))))
|
||||
(get-output-string port)))))))
|
||||
(put-string port frame-name)) ; 'ambiguous / unmapped: bare name
|
||||
(when (fx>? cnt 1)
|
||||
(put-string port " (x") (put-string port (number->string cnt)) (put-string port ")"))
|
||||
(put-char port #\newline)
|
||||
(loop tail (fx+ shown 1))))))))))
|
||||
|
||||
;; Multi-line backtrace for an uncaught value. Two sources, in preference order:
|
||||
;; 1. The tail-frame history ring (rt.ss), when JOLT_TRACE enabled it — an
|
||||
;; execution history of the runtime-compiled fns entered before the throw,
|
||||
;; INCLUDING ones TCO erased from the live continuation. Most-recent first.
|
||||
;; 2. Otherwise the live continuation (jolt-frame-records) — the accurate but
|
||||
;; TCO-truncated non-tail spine.
|
||||
;; Each frame maps to "ns/name (file:line)" when registered, else its bare name.
|
||||
;; #f when neither source yields a frame (the caller then prints just the location).
|
||||
;; The tail-frame history ring rendered as a backtrace, or #f when tracing is off /
|
||||
;; empty. A mapped frame is kept; else drop plumbing (same rule as the continuation
|
||||
;; path) so the two sources read consistently.
|
||||
(define (jolt-history-backtrace)
|
||||
(let* ((hist (jolt-trace-snapshot))
|
||||
(recs (let loop ((ns hist) (acc '()))
|
||||
(if (null? ns)
|
||||
(reverse acc)
|
||||
(let* ((nm (car ns)) (src (hashtable-ref source-registry nm #f)))
|
||||
(loop (cdr ns)
|
||||
(if (or src (not (srcreg-plumbing-name? nm)))
|
||||
(cons (cons nm src) acc) acc)))))))
|
||||
(and (pair? recs) (jolt-render-recs recs))))
|
||||
|
||||
(define (jolt-backtrace-string v)
|
||||
(or (jolt-history-backtrace)
|
||||
(let ((k (jolt-error-continuation v)))
|
||||
(and k
|
||||
(let ((recs (jolt-frame-records k)))
|
||||
(and (pair? recs) (jolt-render-recs recs)))))))
|
||||
|
||||
;; Exposed for the REPL / nREPL error paths, which catch errors themselves instead
|
||||
;; of going through the uncaught reporter. Returns the " trace:\n<frames>" block
|
||||
;; from the tail-frame HISTORY only — the live continuation in a REPL is just the
|
||||
;; REPL's own machinery — or nil when tracing is off (so a caller can when-let).
|
||||
(def-var! "jolt.host" "backtrace-string"
|
||||
(lambda ()
|
||||
(let ((bt (jolt-history-backtrace)))
|
||||
(if bt (string-append " trace:\n" bt) jolt-nil))))
|
||||
|
||||
;; Render an uncaught jolt throw (any value, not just a Chez condition) to a port:
|
||||
;; an ex-info shows its message + ex-data (+ a host cause); anything else is
|
||||
|
|
|
|||
|
|
@ -172,6 +172,14 @@
|
|||
(def var-cache? (atom false))
|
||||
(defn set-var-cache! [on] (reset! var-cache? on))
|
||||
|
||||
;; Opt-in tail-frame history (JOLT_TRACE): emit a (jolt-trace-push! "name") at the
|
||||
;; head of every named fn body, so an entry records the frame into the runtime ring
|
||||
;; buffer (rt.ss) and a TCO-elided frame still shows in an error's backtrace. OFF
|
||||
;; during the seed mint and `jolt build` (byte-determinism + no runtime cost);
|
||||
;; compile-eval.ss turns it on for runtime-eval'd user code when JOLT_TRACE is set.
|
||||
(def trace-frames? (atom false))
|
||||
(defn set-trace-frames! [on] (reset! trace-frames? on))
|
||||
|
||||
;; A direct-link Scheme binding name for a var. The fqn maps to a unique identifier
|
||||
;; jv$<ns>$<name>; chars that break a Scheme identifier or the `$` separator are
|
||||
;; escaped so distinct vars never collide.
|
||||
|
|
@ -191,6 +199,13 @@
|
|||
;; recursion auto-restores them (no manual save/restore, no throw-leak).
|
||||
(def ^:dynamic *recur-target* nil)
|
||||
(def ^:dynamic *known-procs* #{})
|
||||
;; True while emitting a node in TAIL position. Only used, in trace mode, to mark a
|
||||
;; tail call so the runtime routes its callee into the current history rib instead
|
||||
;; of a new one (rt.ss). It never affects semantics — a wrong value only mislabels
|
||||
;; a debug trace line — so partial propagation is safe. `emit` (the wrapper below)
|
||||
;; clears it by default; the tail-transparent forms (fn body, if/do/let/loop) pass
|
||||
;; it to their tail child. Default false so a top-level form is treated non-tail.
|
||||
(def ^:dynamic *tail?* false)
|
||||
|
||||
(def ^:private gensym-counter (atom 0))
|
||||
(defn- fresh-label [prefix] (str prefix (swap! gensym-counter inc)))
|
||||
|
|
@ -253,6 +268,17 @@
|
|||
(if (or (contains? scheme-reserved s) (contains? bare-native-names s)) (str "_" s) s)))
|
||||
|
||||
(declare emit)
|
||||
(declare emit*)
|
||||
;; Ops that pass tail position through to a child (the child can itself be a tail
|
||||
;; call): if/do carry it to their tail branch/last form, let/loop to their body,
|
||||
;; and invoke reads it to decide whether the call is tail. Every other op's
|
||||
;; children are non-tail, so `emit` clears *tail?* before dispatching them — that
|
||||
;; way a stray true can't leak into, say, a call sitting in a vector literal.
|
||||
(def ^:private tail-transparent-ops #{:if :do :let :loop :invoke})
|
||||
(defn emit [node]
|
||||
(if (and *tail?* (not (tail-transparent-ops (:op node))))
|
||||
(binding [*tail?* false] (emit* node))
|
||||
(emit* node)))
|
||||
|
||||
;; A Chez string literal. Every char outside printable ASCII becomes a
|
||||
;; codepoint hex escape \x<cp>; ; the named escapes (\n \t \r \" \\) match what
|
||||
|
|
@ -413,9 +439,10 @@
|
|||
;; letfn lowers to a :let flagged :letrec (mutually-recursive named local fns):
|
||||
;; Scheme `letrec*` binds them so each sees its siblings. A plain let uses let*.
|
||||
(defn- emit-let [node]
|
||||
(let [kw (if (:letrec node) "letrec*" "let*")]
|
||||
(str "(" kw " (" (str/join " " (map emit-binding (:bindings node))) ") "
|
||||
(emit (:body node)) ")")))
|
||||
(let [kw (if (:letrec node) "letrec*" "let*")
|
||||
;; bindings are non-tail; the body inherits the let's tail position
|
||||
binds (binding [*tail?* false] (str/join " " (mapv emit-binding (:bindings node))))]
|
||||
(str "(" kw " (" binds ") " (emit (:body node)) ")")))
|
||||
|
||||
(defn- emit-loop [node]
|
||||
(let [label (fresh-label "loop")
|
||||
|
|
@ -423,9 +450,10 @@
|
|||
names (map #(munge-name (nth % 0)) pairs)
|
||||
;; inits evaluate in the OUTER scope (recur-target unchanged) and, like
|
||||
;; Clojure loop/let, SEQUENTIALLY — wrap a let* around the named let.
|
||||
inits (map #(emit (nth % 1)) pairs)
|
||||
inits (binding [*tail?* false] (mapv #(emit (nth % 1)) pairs))
|
||||
seq-bs (str/join " " (map (fn [n i] (str "(" n " " i ")")) names inits))
|
||||
rebinds (str/join " " (map (fn [n] (str "(" n " " n ")")) names))
|
||||
;; the loop body inherits the loop's tail position
|
||||
body (binding [*recur-target* label] (emit (:body node)))]
|
||||
(str "(let* (" seq-bs ") (let " label " (" rebinds ") " body "))")))
|
||||
|
||||
|
|
@ -486,7 +514,11 @@
|
|||
params (map munge-name orig)
|
||||
restp (when-let [r (:rest a)] (munge-name r))
|
||||
label (fresh-label "fnrec")
|
||||
body (binding [*recur-target* label] (emit (:body a)))
|
||||
ret (:ret-nhint a)
|
||||
;; the body is the fn's tail position — UNLESS a ^double/^long return hint
|
||||
;; wraps it in a coercion below, which puts the body back in non-tail.
|
||||
body-tail? (not (or (= ret :double) (= ret :long)))
|
||||
body (binding [*recur-target* label *tail?* body-tail?] (emit (:body a)))
|
||||
paramlist (cond
|
||||
(and restp (empty? params)) restp
|
||||
restp (str "(" (str/join " " params) " . " restp ")")
|
||||
|
|
@ -511,6 +543,16 @@
|
|||
self (when-let [nm (:name node)] (munge-name nm))
|
||||
clauses (binding [*known-procs* (if self (conj *known-procs* self) *known-procs*)]
|
||||
(mapv emit-arity-clause arities))
|
||||
;; trace mode: record this frame on entry (before the body), so a frame
|
||||
;; the body then tail-calls away is still in the ring at throw time. A
|
||||
;; `recur` re-enters via the named-let, not the lambda, so a tight loop
|
||||
;; records once, not per iteration.
|
||||
clauses (if (and @trace-frames? self)
|
||||
(mapv (fn [c] [(nth c 0)
|
||||
(str "(begin (jolt-trace-push! " (chez-str-lit self) ") "
|
||||
(nth c 1) ")")])
|
||||
clauses)
|
||||
clauses)
|
||||
lambda (if (= 1 (count clauses))
|
||||
(let [c (first clauses)] (str "(lambda " (nth c 0) " " (nth c 1) ")"))
|
||||
(str "(case-lambda "
|
||||
|
|
@ -573,7 +615,30 @@
|
|||
(= (nth shape i) kw) i
|
||||
:else (recur (inc i))))))
|
||||
|
||||
;; A plain Scheme application: (callee op ...).
|
||||
(defn- plain-call [callee operand-strs]
|
||||
(str "(" callee (if (seq operand-strs) (str " " (str/join " " operand-strs)) "") ")"))
|
||||
;; A tail call in trace mode. Force-bind the operands to temps FIRST (so any
|
||||
;; operand whose own evaluation records a trace entry runs before our mark), THEN
|
||||
;; set the tail mark, THEN apply — the callee's entry prologue consumes the mark
|
||||
;; with nothing in between, so it can't be clobbered. Still a tail call: the let*'s
|
||||
;; last form is the application, so TCO is preserved.
|
||||
(defn- tail-marked-call [callee operand-strs]
|
||||
(let [tmps (mapv (fn [_] (fresh-label "_tt$")) operand-strs)
|
||||
binds (str/join " " (map (fn [t a] (str "(" t " " a ")")) tmps operand-strs))]
|
||||
(str "(let* (" binds ") (jolt-trace-mark! #t) " (plain-call callee tmps) ")")))
|
||||
;; Emit a call, tail-marked when we're in tail position and tracing is on; a plain
|
||||
;; application otherwise. The mark is consumed by the callee's entry prologue —
|
||||
;; direct calls (:local known-proc, direct-link) always have one; a jolt-invoke
|
||||
;; call usually reaches one but not always (see the best-effort note in rt.ss).
|
||||
(defn- emit-call [tail? callee operand-strs]
|
||||
(if (and @trace-frames? tail?)
|
||||
(tail-marked-call callee operand-strs)
|
||||
(plain-call callee operand-strs)))
|
||||
|
||||
(defn- emit-invoke [node]
|
||||
(let [tail? *tail?*] ; capture: children below emit non-tail
|
||||
(binding [*tail?* false]
|
||||
(let [fnode (:fn node)
|
||||
arg-nodes (:args node)
|
||||
args (mapv emit arg-nodes)
|
||||
|
|
@ -586,8 +651,7 @@
|
|||
;; order [callee & args] together when ordering is observable.
|
||||
invoke (fn []
|
||||
(ordered-call (cons fnode arg-nodes) (cons (emit fnode) args)
|
||||
(fn [[f & as]]
|
||||
(str "(jolt-invoke " f (if (seq as) (str " " (str/join " " as)) "") ")"))))]
|
||||
(fn [operands] (emit-call tail? "jolt-invoke" operands))))]
|
||||
(cond
|
||||
;; devirtualized protocol call: the inference proved the receiver (arg 0) is
|
||||
;; one record type, so resolve the impl by that static tag instead of routing
|
||||
|
|
@ -662,8 +726,7 @@
|
|||
;; holds an arbitrary IFn -> dynamic dispatch.
|
||||
(= :local (:op fnode))
|
||||
(if (*known-procs* (munge-name (:name fnode)))
|
||||
(order-args (fn [as] (str "(" (munge-name (:name fnode))
|
||||
(if (seq as) (str " " (str/join " " as)) "") ")")))
|
||||
(order-args (fn [as] (emit-call tail? (munge-name (:name fnode)) as)))
|
||||
(invoke))
|
||||
;; closed-world direct call: the callee var is an app fn def already emitted
|
||||
;; with a Scheme binding — apply it directly, no var lookup, no jolt-invoke.
|
||||
|
|
@ -672,8 +735,7 @@
|
|||
;; below (which still uses the direct binding as the invoke target).
|
||||
(and (= :var (:op fnode)) (direct-linkable? (:ns fnode) (:name fnode))
|
||||
(direct-link-fn? (:ns fnode) (:name fnode)))
|
||||
(order-args (fn [as] (str "(" (dl-name (:ns fnode) (:name fnode))
|
||||
(if (seq as) (str " " (str/join " " as)) "") ")")))
|
||||
(order-args (fn [as] (emit-call tail? (dl-name (:ns fnode) (:name fnode)) as)))
|
||||
;; a late-bound :var call head can hold a procedure OR a non-applicable
|
||||
;; value the RT dispatches (multimethod, keyword/coll IFn) — route via
|
||||
;; jolt-invoke (transparent for a procedure).
|
||||
|
|
@ -681,7 +743,7 @@
|
|||
(invoke)
|
||||
;; a computed callee can yield ANY IFn — route through jolt-invoke.
|
||||
:else
|
||||
(invoke))))
|
||||
(invoke))))))
|
||||
|
||||
;; try/catch/finally. throw raises a Chez condition wrapping the jolt value
|
||||
;; (jolt-throw = Scheme `raise` of a &jolt-throw condition); catch lowers to
|
||||
|
|
@ -728,7 +790,7 @@
|
|||
(returns-scheme-bool? (:body node) bools'))
|
||||
:else false)))
|
||||
|
||||
(defn emit [node]
|
||||
(defn emit* [node]
|
||||
(case (:op node)
|
||||
:const (emit-const (:val node))
|
||||
:local (munge-name (:name node))
|
||||
|
|
@ -776,11 +838,14 @@
|
|||
:host-new (str "(host-new " (chez-str-lit (:class node))
|
||||
(let [args (map emit (:args node))]
|
||||
(if (empty? args) "" (str " " (str/join " " args)))) ")")
|
||||
;; the test is non-tail; then/else inherit the if's tail position
|
||||
:if (let [test (:test node)
|
||||
t (if (returns-scheme-bool? test) (emit test)
|
||||
(str "(jolt-truthy? " (emit test) ")"))]
|
||||
t (binding [*tail?* false]
|
||||
(if (returns-scheme-bool? test) (emit test)
|
||||
(str "(jolt-truthy? " (emit test) ")")))]
|
||||
(str "(if " t " " (emit (:then node)) " " (emit (:else node)) ")"))
|
||||
:do (str "(begin " (str/join " " (map emit (:statements node)))
|
||||
;; non-last statements are non-tail; the ret inherits the do's tail position
|
||||
:do (str "(begin " (binding [*tail?* false] (str/join " " (mapv emit (:statements node))))
|
||||
(if (empty? (:statements node)) "" " ") (emit (:ret node)) ")")
|
||||
:invoke (emit-invoke node)
|
||||
;; collection literals -> rt constructors (collections.ss). Elements are
|
||||
|
|
|
|||
|
|
@ -147,6 +147,9 @@
|
|||
;; loaded — same context a run gets, so (require '[some.lib]) works in the REPL.
|
||||
(try (apply-project! (deps/resolve-project (project-dir)))
|
||||
(catch :default _ nil))
|
||||
;; REPL-driven development: trace by default so an uncaught error in evaluated
|
||||
;; code shows a tail-frame backtrace, no JOLT_TRACE needed (JOLT_TRACE=0 opts out).
|
||||
(jolt.host/enable-trace!)
|
||||
(println (str ";; jolt " (version) " repl — :repl/quit or ^D to exit"))
|
||||
(loop []
|
||||
(let [form (repl-read-form)]
|
||||
|
|
@ -160,7 +163,9 @@
|
|||
(catch :default e
|
||||
(println "error:" (or (ex-message e)
|
||||
(try ((resolve 'jolt.host/condition-message) e) (catch :default _ nil))
|
||||
(pr-str e)))))
|
||||
(pr-str e)))
|
||||
(when-let [bt (jolt.host/backtrace-string)]
|
||||
(print bt))))
|
||||
(recur)))))))
|
||||
|
||||
;; A deps.edn :tasks entry: a string is a shell command; a map is {:main-opts …}.
|
||||
|
|
|
|||
|
|
@ -188,7 +188,10 @@
|
|||
(try (when (and ns-str (not (str/blank? ns-str)) (find-ns (symbol ns-str)))
|
||||
(in-ns (symbol ns-str)))
|
||||
(reset! result (load-string code))
|
||||
(catch :default e (reset! err (err-msg e)))))]
|
||||
(catch :default e
|
||||
(reset! err (str (err-msg e)
|
||||
(when-let [bt (jolt.host/backtrace-string)]
|
||||
(str "\n" bt)))))))]
|
||||
{:value (when (nil? @err) (pr-str @result))
|
||||
:out out
|
||||
:ns (str (ns-name *ns*))
|
||||
|
|
@ -277,6 +280,11 @@
|
|||
no-op."
|
||||
([port] (start port nil))
|
||||
([port middleware]
|
||||
;; An nREPL session is REPL-driven development: trace by default so an uncaught
|
||||
;; error in code evaluated over the connection shows a tail-frame backtrace, with
|
||||
;; no JOLT_TRACE needed. Covers both `--nrepl-server` and an app that starts its
|
||||
;; own server under `-M:run` (reload a namespace to trace already-loaded code).
|
||||
(jolt.host/enable-trace!)
|
||||
(let [handler (build-handler (resolve-middleware (or middleware [])))
|
||||
fd (listen-socket port) ; throws on bind/listen failure
|
||||
stopped (atom false)]
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue